Grinding machine



May 28, 1935. c. BOOTH Er Al.' f 2,002,489

\ GRINDING MAcHINE .Filed July 3, 1951 4 sheets-sheet 1 mventor Gttorneg May 28, 1935. c.'Boo1-H Er AL 4 GRINDING MACHINE Filed July 3, 1931 4 Sheets-Sheet 2 mttomcg May 28, 1935. c. BOOTH Er AL l GRINDING MACHINE Filed July 3, 1931 4 Sheets-Sheet 3 mw. Nm

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May 2s, 1935. BQOTH Er 2,002,489

GRINDING MACHINE Filed Ju1y 5. 1931 4 sheets-Sheet 4 Patented May 28, 1935 UNITED STATES GRINDING MACHINE Clement Booth and Andrew Strom, Cincinnati,

Ohio, assignors to Cincinnati Grinders Incorporated, Cincinnati, Ohio Ohio, a corporation of Application July 3, 1931, Serial No. 548,609

14 Claims.

' This invention relates to improvements in grinding machines and especially to improvements in what are commercially known as centerless grinders.

An object of the invention is the provision of an improved grinding .machine for grinding formed work pieces. l l

Another object of the invention is the provision of improved means for presenting and 1o feeding a formed work piece to and through the throat of 'a centerless grinder.

A further object of the invention is the provision of an improved grinding machine for automatically, accurately and expeditiously grinding tapered barrel shaped rolls r similar work pieces having a circular' cross section and a convexed surface.

A still further and specific object of the invention is the provision of a centerless grinder having formed grinding and regulating wheels cooperating with' an improved feeding mechanism for positively feeding the work pieces in an arcuate path through the throat of the centerless grinder to grind tapered convexed rolls to a true circular cross section.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawings andit is to be understood that any modifications may be made in the exact structural details there lshown and described, within the scope of the appended claims, without departing from or exceeding the spiritof the invention.

In the drawings:

'Figure 1 is a front elevation of a centerless grinder embodying the improvements of this invention.

Figure 2 is an enlarged fragmentary illustra- 40 tion of the parts forming the grinding throat with the enclosing housings removed.

Figure 3 is a transverse sectional view through the throat of the device illustrated in Figure l.

Figure 4 is a sectional view taken substantially on line 4-4 of Figure 2.

Figure 5 is a plan view of the parts as seen substantially from line 5-5 of Figure 4.

Figure 6 is a sectional view taken substantially on line 6--5 of Figure 5.

Figure 7 is a view of the loading mechanism, as seen from line 1-1 of Figure 2.

Figure 8 is a perspective view of the work piece to be operated upon by the machine illustrate in the drawings.

trating the discharge of the work at the end of its travel.

' Throughout the several views of the drawings similar reference characters are employed to denote the same or similar parts.

The invention has been illustrated in connection with a standard centerless grinder which machine may comprise a bed I II having rising therefrom the pedestal bearing II for a spindle to which is secured for movement .therewith the grinding -Wheel I2. The bed is further provided on its upper end with ways I3 guiding for movement toward and from the grinding wheel a slide I4 in turn supporting a. second slide I5 carrying the housing I6 in which is journaled the spindle Il. Secured to the free end of thespindle vI1 is a formed regulating wheel IB for movement therewith and the spindle has secured to it intermediate its ends a sprocket I9 about which is trained sprocket chain 20 for rotating the said spindle. y

The grinding and regulating wheels are spaced from one another to provide a grinding throat therebetween and the said wheels are rotated in a clockwise direction whereby the proximate points of the wheels on opposite sides of the throat travel in opposite directions, the grinding wheel traveling downwardly and the regulating wheel upwardly, as seen in Figure 1. I'he grinding wheel is rotated at a rapid rate of speed to effect a stock removal from the work while the regulating wheel rotates at acomparatively slower rate of speed for frictionally controlling the rate of rotation of the work.

The slides Il and I5 arevadapted to be shifted relative to one another to adjust the grinding throat to the desired size while the said slides are moved as a unit for effecting an in-feed grinding operation. For this purpose there are provided clamps 2| for securing the lower slide to the bed and a clamp 22 for securing the slides to one another. Movement of the slides is effected through van adjusting screw 23 having threaded engagement with an oscillating nut 24 carried by the housing I6. The screw is mounted at its free end in a bearing 25 secured to an overhanging bracket portion 26 of the bed. lA hand wheel 21 is secured to the screw exteriorly of the bearing 25 whereby same may be operated.

In the operation of thel machine, as illustrated `in the drawings, the grinding and regulating wheels are adjusted to the desired point and locked and the work is-automatically fed through the said grinding throat. For this purpose there is secured to the regulating wheel I8 a bevel gear 30 journaled ina bracket 3i which is supported as at 31a by the housing i6. The bevel pinion 29 has integral therewith a spur pinion 32 meshing with a spur gear 33 on splined shaft 34 journaled at one end as at 35 in the regulating wheel housing l5. The splined shaft 34 is further journaled in a bearing 39a. upstanding from a bracket 39 from which bearing 35a the shaft extends through the bearing hub 35 of a bevel pinion 31 journaled in a bearing 38 carried by bracket 39. The bracket 39 is secured to the base 39a on the forward end of lower slide l4.` A bevel gear 40 keyed to a vertical shaft 4I meshes with and derives its power from the bevel pinion 31. The bevel gear 48 has a hub 42 extending therefrom received and journaled ina bushing 43 carried by bracket 39. Secured to the vertical shaft 4I for movement therewith is a spur pinion 44 in turn meshing with a large gear 45 secured to, as by screws orbolts 45, a star wheeler cam 41. A clamp lplate 48 received in a recess in the gear 45 'clamps `the said gear and cam 41 through the agency of base 39a of the bracket 39 by means of a boss 5I integral with the base 39a so that an arm 52 extending from work rest block 53 may underlie the cam 41.

From the foregoing it will be noted that rotation of the gear 45 and cam 41 derives its power from the regulating wheel spindle I1 therefore the rotation of the regulating wheel I8 and cam 41 is synchronized one with the other.

'Ihe cam 41, as illustrated in Figure 5, has extending from it the arms 54 and receives therebetween a roller 55 carried by the end of the arm 52 through the agency of a screw 58 which extends through the roller into the arm. The work rest block 58 adjacent the arm 52 is provided with a bearing 51 through which a stud 58 passes, the stud being secured in the base 39a and forms the axis about which the block 53 oscillates. A spring 59 is coiled about the stud 58 and has one end 30 secured in the bracket 53 and the other end 8| secured in the base 39a. A lock nut 82 on the end of the stud 58 prevents disassociation of the parts. The block 53 is further provided with a bearing way-or groove 83 receiving a track 84 integral with or secured to the base 39a.

, As the cam 41 is rotated the arms 54 thereof successively pick up the roller 55 and oscillate the bracket 53 against the resistance of the spring 59 in a clockwise direction, as seen in Figure 6. As the roller-passes over the pushing arm the spring 59 returns the bracket 53 to its normal position or oscillates the same in a counter clockwise direction.

' The bracket 53 carries at its upper end a work rest blade 55 having a seat portion 98 intermediate the lateral side of the blade 55. The face of the seat portion te is inclined as at 31 in Figure d, the direction of inclination being downwardly toward the regulating wheel whereby a work receiving troughis formedt betweenthe said inclined face 51 and face of the regulating wheel.

As will be noted from Figure 8 the work piece 88 to be operated upon is tapered, the -end 53 thereof being of a s aller diameter than the end 18 and the surface a ining the said ends is convexed as at 1I whereby the greatest diameter is intermediate the ends 89 and 18 being nearer the end 18 than the end 519. For this reason the regulating wheel is provided with a circular track or .groove 12 in a spiral form, the tracks being 28 meshing with a bevel pinion 23 fast on a shaft separated by a rib 13. In order that the work may be uniformly rotated while being operated upon the track 12 is undercut as at 13 to clear the portion of the work including the major diameter so that the regulating wheel contacts at points 15 and 15 adjacent the opposite sides of the cut-away part 1@ at points on the Work of substantially equal diameter. This construction insures constant uniform rotation of the work about a definite axis. In order to grind the surface 1I of the work the grinding wheel is concaved, as at 11 in Figure 2.

Referring now to Figures 2 and 6. The axis of the stud 58 is spaced from the active face 11 of the grinding wheel I2 a distance corresponding to the radius of the surface 1I of the work. Therefore, the work in passing through the grinding throat-on the arcuate path determined by the said axis of the stud 58 will have the surface thereof ground tothe desired form. This is further insured by the forming of the seat or track 12 in the regulating Wheel I8 to conform with the opposite side of the work piece 68.

The Awork is automatically loaded on to the seat portion 66 of the blade 85 for which purpose there is provided a chute 18 down which the work 68 rolls by gravity being prevented from discharge from the chute by a spring loaded latch 19, the latch 19 being pivoted at 80 to the chute 13 and has associated therewith a spring 8|. A trip arm 82 is associated with the latch 19 and cooperates with a cam surface 83 formed on the work rest blade 65. As best seen inl'igure 2, as the work rest blade 65 returns to the loading position the cam 83 rides under the trip arm 82 raising same about its pivot against the resistance of spring 8| and permitting the unfinished work to roll from the chute 18 on the inclinedv surface 51 of the seat portion 56. As the blade 35 travels through the grinding throat the spring 8l forces downwardly the latch 19 into engagement with the second work piece preventing its discharge from the grinding throat.

By reference to Figure 9 itv will be noted that the reverse side of the regulating wheel is provided with an undercut circular groove 85. The end of the cam track 12 terminates at the said rear face of the regulating wheel. A discharge chute 85, see Figures 2 and 3, has its inner end placed below this groove 85 and is positioned at a point indicating the rear terminus of the travel of the blade 55. This terminus of travel is beyond the face of the regulating wheel I8 so the work is no longer contacting therewith, therefore, as soon as the work clears the wheel it rolls by gravity down the inclined seat portion 51 into the end of the chute 86 which in turn is so positioned relative to the machine as to carry the finished work to a suitable receptacle.

What is claimed is:

1. In a grinding machine for grinding tapered radius rolls the combination of opposed contragenerically formed grinding and regulating wheels having a grinding throat therebetween,

the regulating wheel having a spiral track conface conforming to the peripheryof the roll to 75l be ground, an opposed regulating member having a spiral track and contacting with the roll at two points of equal diameter for controlling the rotation of the rolls, the grinding wheel and regulating member being spaced from one another to form a grinding throat, a work rest withinv the grinding throat having an inclined seat extending downwardly toward the regulating member for receiving the Jroll, means for actuating the work and work rest arcuately of the grinding throat, and means for driving the regulating wheel and work rest actuating means in timed sequence.

3. In a grinding machine of the class ldescribed for grinding tapered barrel shaped rolls the combination of a grinding wheel having any operative face conforming to the periphery of the roll to be ground, an opposed regulating member having a spiral track and contacting with the roll at two points of equal diameter for controlling the rotation of the rolls, the grinding wheel` and regulating member being spaced from one another toform a grinding throat, a work rest within the grinding throat having an inclined seat extending downwardly toward the regulating member for receiving the roll, means for 4actuating the work and work Arest arcuately of the grinding throat,- means for driving the i regulating wheel and work rest actuating means in timed sequence, said means including an arm extending from the work rest, a-Geneva wheel for engagement with the arm for actuating same intermittently, and a transmission line between the Geneva wheel and regulating member.

4. In a grinding machine of the class described for grinding tapered barrel shaped rolls the combination of a grinding wheel having an operative face conforming to the periphery of the roll to be ground, an opposed regulating member having a spiral track and contacting with the roll at two points of equal diameter for controlling the rotation of the rolls, the grinding wheel and regulating member being spaced from one another to form a grinding throat, a work rest.

within the grinding throat having an inclined seat extending downwardly toward the regulating member for receiving the roll, means for actuating the work and work rest arcuately of the grinding throat, means for driving the regulating wheel and work rest actuating means in timed sequence, said means including an arm extending from the work rest, a Geneva wheel for engagement with the arm for actuating same intermittently, a transmission line between the Geneva wheel and regulating member, and yielding means for returning the work rest to its normal position.

5.,In a grinding machine of the class described the combination of a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, the operative opposed faces ofthe grinding and regulating wheels being substantially contragenerically formed and the grinding wheel having a concaved operative face and the regulating wheel having a spiral path conforming with the periphery of the work, a work rest blade arcuately shiftable through the throat in a plane substantially parallel to the contrageneric faces of the wheels, meansfor driving' the said wheels at fast and slow speed to respectively effect a stock removal from the work and control vits rotation, and means driven from the regulating wheel for operating the work rest in timed relation with the rotation of the same. V

6. 'In a grinding machine of the class described kwheel having a concaved operative face and the regulating wheel having a spiral path conforming with the periphery of the work, a work rest 'blade arcuately shiftable through the throat in a plane substantially parallel to the contrageneric faces of the wheels, means for driving the sa'id wheels at fast and slow speed to respectively effect a stock removal from the work and control its rotation, means driven from the regulating wheel for operating the work rest in timed relation with the rotation of the same, said means comprising a gear associated with theregulating wheel, a Geneva wheel intermittently oscillating the work rest blade in a given direction, and transmission gearing between the regulating wheel and Geneva wheel.

7. In a grinding machine of the class described the combination of a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, the operative opposed faces of the grinding and regulating wheels being substantially contragenerically formed and the grinding wheel having a concaved operative face and the regulating wheel having a spiral path conforming with the periphery of the work, a work rest blade arcuately shiftable through the -throat in 'a plane substantially parallel to the contrageneric faces of the wheels, means for driving the said wheels at fast and slow speed to respectively effect a stock removal from the work and control its rotation, means driven from the regulating wheel for operating the work rest in timed relation with the rotation of the same, said means comprising a gear associated with the regulating wheel, a Geneva wheel intermittently oscillating the work lrest blade in a given direction, transmission gearing between the regulating wheel and Geneva wheel, and yielding means for actuating the work rest in a direction opposite to that in which it is moved by the Geneva wheel.

8. In a grinding machine of the class described the combination of a pair of opposed grinding and regulating wheels formed to the included contour of a formed work piece, the proximate points of said wheelsbeing spaced from one another -to provide an arcuate grinding throat extending in the direction of the axis of the wheels, a work support within said grinding throat and operable in an arcuate path parallel with the axis of the exteriorly of the throat, and means for automatically depositing work pieces onto the said support when in the loading position, said means including a chute for the work, and means at the end thereof normally preventing discharge of work pieces therefrom.

9. In a grinding machine for grinding formed work pieces the combination of a grindingwheel having a contour contrageneric to the contour to be produced on the work, a work support adjacent the grinding wheel for supporting the work piece, positive means for actuating the work support through a path parallel with the surface of the wheel while supporting the work in contact with the wheel the work support having an stantialiy contrageneric to the operative face o the grin wheel for frictional engagement with the work to control the rotation thereof, and an operative coupling between the friction control means and the positive means for actuating the work support whereby they are actuated in synchronism.

l0. In a centerless grinder for grinding formed work pieces the combination of a pair of opposed grinding and regulating wheels forming a grinding throat conforming substantially to the contour of the work to be produced, a work rest blade having aninclined seat inclining in the direction of the operative face of the regulating wheel for receiving and supporting a work piece, means pivotally mounting the work rest blade for oscillation through the grinding throat, positive means for oscillating said work rest blade in one direction, and yielding means for oscillating the blade in the other direction.

7l1. In a centerless grinder for grinding formed work pieces the combination of a pair of opposed grinding and regulating wheels forming a grinding throat conforming substantially to the contour'of the work to be produced, a. work rest blade having an inclined seat inclining in the direction of the operative face of the regulating wheel for receiving and supporting a work piece, means pivotally mounting the work rest blade for oscillation through the grinding throat, positive means for oscillating said work rest blade in one direction, and yielding means for oscillating the blade in the other direction, said positive means comprising a cam wheel having a plurality of operative portions thereon spaced by a plurality of inoperative portions, and means associated with the work rest blade for engagement with said operative means of the cam wheel. I i

., 12. In a machine for grinding formed work pieces such as tapered barrel rolls the combination of a grinding wheel having a concave operative surface, an opposed regulating wheel having a convex operative surface, the operative surfaces of the grinding and regulating wheels at their proximate point forming an arcuate grinding throat, a work rest blade oscillatable in an arspaanse cuate path through the grinding throat for positively feeding a work piece therethrough, ns for positively actuating the blade in one direction, and means for yieldingly actuating the blade in the other direction.

13. En av machine tor grinding formed work pieces such as tapered barrel rolls the combination of a grinding wheel having a concave operative surface, an opposed regulating wheel having-a convex operative surface, the operative surfaces of the grinding and regulating wheels at their proximate point forming an arcuate grinding throat, a work rest blade oscillatable in an .arcuate path through the grinding throat for positively feeding a work piece therethrough, means for positively actuating the blade-in one direction, means for yieldingly actuating the blade in the other direction, a magazine for unfinished work pieces at one end of the arcimte path of movement of the blade, and a discharge chutep at the other end of the arcuate path of movement of the blade for receiving iinished work pieces therefrom.

. 14. In a machine for grinding formed work pieces such as tapered barrel rolls the combination of a grinding wheel havinga concave operative surface, an opposed regulating wheel having a convex operative surface, the operative surfaces of the grinding and regulating wheels at their proximate point forming an arcuate grinding throat,`a work rest blade oscillatable in an arcuate path'through the grinding throat for positively feeding a work piece therethrough, means for positively actuating the blade in one direction, means for yieldingly actuating the blade in the other direction, a. magazine for unfinished work pieces at one end of the arcuate path of movement of the blade, a discharge chute at the other end of the arcuate path of movement of the blade for receiving ilnished work pieces therefrom. and means automatically actuated for ,releasing an unfinished piece from the magazine onto the work rest blade and operable when the work rest blade is aligned therewith.

CLEMENTBOOTH.

ANDREW STROM. 

